package io;

import java.io.*;

public class CopyDemo2 {
    public static void main(String[] args) throws IOException {
        FileInputStream fis = new FileInputStream("t01043eec7c54708f40.jpg");
        FileOutputStream fos = new FileOutputStream("t01043eec7c54708f40_copy.jpg");
        long start = System.currentTimeMillis();
        byte[] data = new byte[1024*10];
        int len;//记录每次实际读取的字节数
        while ((len = fis.read(data))!=-1){//每次读取10KB并判断是否读取到了末尾
            fos.write(data,0,len);//将字节数组byte从下标0开始连续len个字节写出（做到读多少写多少）
        }
        long end = System.currentTimeMillis();
        System.out.println("复制完成！");
        System.out.println("耗时："+(end-start)+"ms");
        fis.close();
        fos.close();
    }
}
